OTB is a bitmap format for mobile devices, used for operator logos and graphics sent via SMS.
RGBA is a raw image format with red, green, blue, and alpha channels.
FreeFileConvert uses tuned encoding for OTB to RGBA conversions, preserving clarity while trimming file size. Finished images open instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload OTB files from desktop or tablet, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized RGBA results on any device you rely on.
Process up to 5 files sized 1024 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent RGBA images with dependable progress tracking.
OTB images are small monochrome bitmaps optimized for mobile transmission.
RGBA files contain raw 32-bit pixel data with transparency information.
Upload your image file in the OTB format from your device.
Select RGBA as the output format and click Convert. Adjust optional settings if needed.
Download the converted image file. Each file stays available for up to 5 downloads.